What is the beam spot output from the optical fiber coupled laser?

What is the beam spot output from the optical fiber coupled laser?

Dec 08, 2020

What is the beam spot output from the optical fiber coupled laser?

The beam spot output by the optical fiber coupled laser is generally a circular light spot with a certain divergence angle. The specific spot size is related to the fiber core diameter, and the divergence angle is determined by the fiber numerical aperture. Commonly used optical fibers are divided into single-mode and multi-mode. The single-mode core diameter ranges from 2.9 μm to 9 μm, and the multi-mode core diameter ranges from 50 μm to 400 μm. The numerical aperture is generally 0.15NA and 0.22NA. Numerical aperture refers to the sine value of the maximum incident angle at which the light beam undergoes total reflection transmission in the fiber. It can be simply regarded as the divergence angle of the laser after the fiber is emitted. 0.22NA represents the divergence angle (half angle) of approximately 12.5°, and 0.15NA represents the divergence angle of approximately 8°.


What types of fiber optic connectors? What are the characteristics of each?

According to its structure, it can be divided into three types: FC, ST and SMA-905. The appearance is shown in the figure below. Among them, the FC fastening method is a turnbuckle, a ceramic ferrule is used, and the butting end surface has a flat surface (PC) and an 8° angle bevel (APC). This type of connector has the advantage of being reliable. The ST fixing method is a snap-fit type, which is fixed by a bayonet for half a rotation after insertion, which is easy to operate. SMA-905 adopts a screw-locked fixing method. Generally, it is directly processed from metal. It is commonly used in high-power lasers. Its advantages are high temperature resistance and fast heat dissipation.


Elite could customize the laser module with fiber at output power range from 1mW~3000mW.

The diameters of fiber have 4µm, 9µm, single mode fiber, 50µm, 62,5µm, 105µm, 125µm, 170µm, 200µm, multi mode fiber etc. It has SMA, FC or ST connector and different fiber length. The wavelength includes 405nm, 445nm, 520nm, 532nm, 635nm, 650nm, 670nm, 690nm, 740nm, 780nm, 808nm, 830nm, 850nm, 940nm, 980nm. The LD driver or TEC temperature control could be customized. 

Elites Single-mode Fiber Coupling Laser Module (with high power)


Elite’s Pluggable Type Fiber Laser Module ( with low power)


Please share your requirements with us to or 86-29-68590616 for quotation or sample.